2012/06/29 by A. Krzton-Maziopa, A. Krztoń‐Maziopa, E. Pomjakushina +7 · 118 citations
Chemistry · Materials Science · Physics and Astronomy · #Alkali metal #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Crystallography #Ferrocene Chemistry and Applications #Inorganic Chemistry and Materials #Inorganic chemistry #Intercalation (chemistry) #Iron-based superconductors research #Magnetization #Materials science #Metallurgy #Organic chemistry #Selenide #Selenium #Superconductivity #Transition temperature #cond-mat.supr-con
paper · pdf · open access · doi:10.1088/0953-8984/24/38/382202
published in Journal of Physics Condensed Matter 24(38), 382202 (IOP Publishing) · 13 pages, 5 figures
arxiv created 2012/06/29 · openalex publication_date 2012/09/04 · arxiv updated 2012/09/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report on a new iron selenide superconductor with a T(c) onset of 45 K and the nominal composition Li(x)(C(5)H(5)N)(y)Fe(2-z)Se(2), synthesized via intercalation of dissolved alkaline metal in anhydrous pyridine at room temperature. This superconductor exhibits a broad transition, reaching zero resistance at 10 K. Magnetization measurements reveal a superconducting shielding fraction of approximately 30%. Analogous phases intercalated with Na, K and Rb were also synthesized and characterized. The superconducting transition temperature of Li(x)(C(5)H(5)N)(y)Fe(2-z)Se(2) is clearly enhanced in comparison to those of the known superconductors FeSe(0.98) (T(c) ~ 8 K) and A(x)Fe(2-y)Se(2) (T(c) ~ 27-32 K) and is in close agreement with critical temperatures recently reported for Li(x)(NH(3))(y)Fe(2-z)Se(2). Post-annealing of intercalated material (Li(x)(C(5)H(5)N)(y)Fe(2-z)Se(2)) at elevated temperatures drastically enlarges the c-parameter of the unit cell (~44%) and increases the superconducting shielding fraction to nearly 100%. Our findings indicate a new synthesis route leading to possibly even higher critical temperatures for materials in this class: by intercalation of organic compounds between Fe-Se layers.